At 09:35 AM 12/28/01 +1100, you wrote: >My first questions are - > How many segments (shape?) > Size of each segment length x width > >You may do better with lasers scanning prismatic targets to scatter the >light > >Thinking... >MC The problem with the laser is the layout (looked at that one already ;-]). it doesn't easily support line of sight. I would have some concerns about eye damage or exposure to that. The strings are up to 10,000 feet long with a light every 25-30 meters (100ft). It's one light wide and 100 plus long. The layout is linear more or less over broken ground. As long as I can control them so they appear as one string I can break them down into smaller segemnts. Dave -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu